Rock crushing and grinding apparatus



(No Model.)

2 Sheet.s--Sheet; 1. J. H. KINKEAD. ROGK GRUSHING AND GRINDINGAPPARATUS.

Patented Apr 30, 1895'.

Nonms PETERS co.. momuwa. WASHINGTON, n. c

(No. Model.) 2 sneetsshet 2.

A 'J. ,H.- KINKEAD. 1106K GBUSHING AND GRINDING APPARATUS. No. 538,523.Patent-ed Apr. 30, 1 895.

UNITED STATES PATENT QFFICE.

JAMES H. KINKEAD, OF VIRGINIA CITY, NEVADA.

ROCK CRUSHING AND GRINDING APPARATUS.

SPECIFICATION forming part Of Letters Patent No. 538,523, dated April30, 1895.

Application filed July 21, 1894. Serial No. 518,270- (No model.)

To all whom it may concern:

Be it known that I, JAMES H. KINKEAD, a citizen of the United States,residing at Virginia City, Storey county, State of Nevada, have inventedan Improvement in Rock Crushing and Grinding Apparatus; and I herebydeclare the following to be a full, clear,

, and exact description of the same.

My invention relates to improvements in rock crushing and grindingapparatus.

It consistsin certain details of construction which will be more fullyexplained by reference to the accompanying drawings, in which- Figure 1is a vertical sectional elevation of my apparatus. Fig. 2 is a planview.

The object of my invention is to provide a machine for crushing andgrinding rock, and especially quartz and other valuable metal bearingrock.

A is an iron pan having a raised or convex bottom, the radial lines ofwhich are straight, as shown, and sides which extend upwardly andoutwardly from the periphery of the bottom at essentially right anglestherewith. lVithin the pan is fixed an iron die B which is secured withbolts, wooden wedges or other devices so as to be removable, and thisreceives the wear and may be replaced whenever necessary. Around the topof the pan is ,a ledge to which is fixed a cylindrical screen framehaving screen openings D made in it at as many points around thecircumference as may be desired. Through screens fixed in theseopenings, the pulverized material is discharged as fast as it becomesfine enough to pass the meshes of the screen, and falls into asluice orchannel E which is cast around the periphery of the pan.

The crushing and grinding device consists of a pan-shaped muller Fhaving a bottom which is made convex, to produce a concave grindingsurface but of a convexity less than that of the bottom of the pan, themuller having also sides extending upward at an angle approximately atright angles with the bottom of the muller. Upon the exterior of thismuller is fixed an iron shoe G, either in a continuous piece or insections, the bottom of the shoe having a concavity which is a littleless in depth than the corresponding convexity of the die of the outerpan, and the sides of the shoe extend upwardly in such a manner thatwhen the muller is tilted or rolled around Within the pan, the bottomand sides of the shoe form a close contact with the inner face of thedie of the pan upon one side, while a considerable space will be leftupon the opposite side. As the muller is rolled around within the pan,this space is constantly changing, and the sides and bottom of themuller are continually closing in against the sides and bottom of thepan so as to produce a consecutive grinding and crushing action allaround the interior periphery of the pan.

The movement of the muller is produced by means of a shaft H keyed intothe central huh I of the muller and extending upwardly to some distanceabove the pan. Above the pan and in line with its center is a verticalshaft J, having suitable driving pulleys or gears K by which motion isimparted to it. Upon the lower end of this shaft is fixed a crank Lwhich projects horizontally to one side, and has an opening at its endadapted to receive the upper end of the shaft H which fits loosely intothe opening, and when the guiding shaft is caused to rotate, the upperend of the shaft H, which connects with the muller, is carried around ina circle equal to the diameter of the circle in which the crank travels.This causes the tilting or rolling motion of the muller within the panat the bottom, and the continuous contact of the different portions ofthe muller and pan sides by which crushing is produced.

The bottom of the muller has formed in it slots or openings M, and theore or other material to be crushed is delivered into the inside of themuller, gradually passing through these openings, and as it revolvesaround Within the pan, the ore will pass through the openings andbetweenthe muller shoe and the die, and will be crushed as the muller rollsaround within the pan.

The weight and momentum of the apparatus is sufficient to crush any oreor rock which may be employed, and as fast as it becomes sufficientlyline it will be delivered through the screens previously described.

Having thus described my invention, what I claim as new, and'desire tosecure by Letters Patent, is-

An improved crushing and grinding apparatus consisting of a pan having aconical bottom declining outwardly from the center, sides extendingupwardly at right angles therewith, a panshaped muller havinga conicalbottom and diverging sides, said bottom having a concavity slightly lessin depth than the corresponding convexity of the bottom of the pan, andsaid muller being entirely open at its top whereby its sides and bottomform a deep receiving chamber into which the ore to be crushed isdelivered, and having said bottom provided with openings which arecovered when the bottom of the muller forms close contact with thecorresponding grinding face of the pan, and opened or exposed when themnller lifts away from said grind- JAMES 11 KINKEAD.

Vitnesses:

J. MATHESON, O. E. MACK.

